Ventilator



April 25, 1933. H. s. NOWITSKY VENTILATOR Filed June 2, 1952 2 Sheets-Sheet 2 Patented Apr. 25, 1933 HERMAN S. NOWITSKY, OF NORFOLK, VIRGINIA Application filed June '2,

This invention relates to an improved ventilator for withdrawing foul air and gases from enclosures and buildings of various types and it has more specific reference to a structure for ventilating motion picture booths.

As stated more specifically the invention comprehends the use of a practicable and efficient motor driven exhaust fan ventilator to be used as a direct exhaust on the lamp houses of the motion picture projectors in present day operating booths.

' The foregoing is not intended to imply that the ideaof an exhaust fan for struc-. tures of this class is broadly new, for it is not. As a matter of fact practically all modern picture projection booths are provided with exhaust fan equipped ventilating structures. Ordinarily the structure comprises exhaust ducts leading to the atmosphere having a motor driven suction fan located therein. Under the usual arrangement the motor is positioned in the duct'in such a way as to permit the shaft bearing and motor itself to be exposed'to the hot discharging air and gases and this is detrimental to the efliciency of the motor. It is of course not infrequent to have fires start in booths of this class and naturally the gases, chemicals and flames are struck through the exhaust ducts, whereby the damage can render the motor inoperative.

Another disadvantage noted in the present day arrangement is that sparks from the commutator of the motor sometimes ignite the gases in the upper portion of the booth and duct,thus. starting a fire, and when the fire is under way'the motor is rendered out of commission at a time when it is needed.

With the foregoing points of danger and needless disadvantages in mind I have evolved and produced a simplified arrangement to overcome these disastrous results, the improved structure comprising a double compartment casing with the duct and fan 10- 1932. Serial No, 615,058.

cated in one compartment and the motor isolated and protected in the other compartment.

Hence the chief advantage of the i nventio n is that by properly isolating and insulating the motor no workingparts are exposed to the path of the gases, burnt carbon, grit, chemicals and flames. Manifestly then this is regarded as'a novel contribution'to the trade and the art possessing features of safety and economy. 7

Another advantage is that the motor:is encasedin a. metal housing or casing which eliminates the danger ofthe sparks of the motor igniting the inflammable material in the attic of theaters whereprojection booths are generally installed, and at the same time the motor is cooled'by appropriate meansto be hereinafter described. r

A further advantage and feature is in the A provision of a portable'compact self contained structure capable of being constructed in standard sizes for application to present day booths and duct systems without requiring extensive alterations in the existing and stock parts and in accordance withmy are rang'ement it is possible to use much smaller fans and motor than is at present required for the purpose. a Other features and advantages 'of theinvention will become more readily apparent from the following description and draw lugs. In the accompanying illustrative draw lngs Figure 1 is a side elevational view of one embodiment of the invention showing the A manner in which it is installed in the upper portion of a picture projection booth.

Figure 2 is a'view in longitudinal section and elevation disclosing the assembly "of parts of the structure seen in Figure-1, the section being taken approximately on the plane of the line 2-2 of Figure 3.

Figure 3 is a front end view of Figure 2 observing the same in a direction from left to right.

Figure 4 is a view somewhat similar to Figure 1 showing the different embodiment of the invention.

Figure 5 is a longitudinal sectional view through the type of the invention illustrated in Figure 4.

Figure 6 is a sectional and elevational view of still another arrangement embodying the same fundamental principles and generic structure.

Figure 7 is a view similar to Figure 5 showing a horizontal duct type with an outboard bearing.

As before stated the ventilator is of course applicable to enclosures other than motion picture booths. For the purpose of description and explanation however I have shown Figure 1 an enclosure which may be designated as a booth 8. -The'ventilator is indicated as a unit by the numeral 9 and 10 designates a gas and air discharge pipe and 11 represents another delivery pipe leading from the ventilator to'a suitable point.

Referring now to Figure 2 it will be seen that the ventilator comprises a horizontally elongated metal casing 12 built around an appropriate internal open work frame structure 13. In the bottom wall is an inlet nipple 14 attached to the exhaust pipe, 10 and in the left hand end wall a similar discharge nipple orlcollar 15 to which the pipe 11 is connected.

The casing is divided internally by a partition 16 into distinguishable compartments 17 and 18 respectively. Located in the compartment 17 is the inlet 14 and a. complementalcurved deflector plate 19 which functions to define the exhaust duct. The fan shaft 20 is journalled for rotation in a bearing carried by a suitable spider 21 located in the duct and on this end of the shaft is the suction fan 22 which may be any appropriate construction. The intermediate portion of the shaft is journalled in a bearing 23 supported in the partition and extends into the motor compartment 18 in which the electric motor 24 is contained. The motor shaft 25 is joined to the fan shaft through the medium of an insulating coupling 26 of any appropriate construction. The numeral 27 designates an air hole which is screened to provide for ventilation and cooling of the motor, the air current being sucked from the atmosphere through the opening 27 drawn through the tube 28 which affords communication between the twocompartments by way of a screened opening 29 in the deflector plate 19. Both compartments are provided with doors 30 and 31 respectively to permit convenient access to behad to the interior for making replacement and repairs and for oiling etc. 7

The samebasic idea of construction is carried forward in the form of the invention illustrated in Figures 4 and 5 wherein the elongated casing is distinguished by the numeral 32. Here again there is an internal partition 33 which as seen in Figure 5 defines a relatively small front compartment 34 and a somewhat larger rear compartment 35. The partition as well as the end wall of the compartment 35 is provided with a screened air circulation aperture 36 and both of these are provided with pivotally mounted closure plates 37 of a well known gravity type which when the fan 38 is in rotation are swung open to allow air to circulate through the compartment 35 for cooling the motor 39. The motor is isolated from the exhaust duct defined by'the 'curveddefiector plate 40 located'in the compartment 34 having an opening 41 to permit circulation of air for motor cooling purposes. I It will be noted in this arrangement that the fan shaft 42 is mounted in the appropriate anti-friction bearing 43 located wholly within the'compartment 35; Moreove'rthe fan shaft is joined to the motor shaft through the medium of an insulating flexible coupling 44. Then too there is a flywheel 45 on the shaft within the compartment 35 to balance theoperation ofthe fan and to provide smooth and dependable operation. Incidentally the flywheel is an optional feature.

7 It is understood that in accordance with the principles of invention, the casing may be arranged horizontally or-vertically or at any requisite angle to make-proper connections-with the exhaust duct and pipe of clifferent types of booths.

In Figure 6 I have shown a Vertical type arrangement'whereinthe duct 46 is in the form of an elbow having aspider 47 located in the discharge end 48 to accommodate the suction fan 49. The fan shaft 50 is mounted in an appropriate bearing 51 and joined by an insulating coupling 52 to the motor shaft 53. The motor is supported on an appropriandconfined within a special isolated housing 56 having a. screened air inlet 57 for motor cooling'purposes. I

Attention is now called to Figure 7 showintake end 59 located for connection with the delivery pipe (not shown) and its discharge end 60 appropriately constructed and arrangedto accommodate another gas carrying pipe or for simply discharging the at- I ate stand 54, the motor being indicated at 55 ing a somewhat S-shaped duct 58 having its .1

shaft extends through the duct and is mounted in an outboard bearing 67 supported on an appropriate extension frame 68. This is a desirable arrangement to locate both of the fan shaft bearings outside of the duct and to prevent damage and wear and tear on the bearings.

Generically stated in all forms of the in' vention here illustrated and described the exhaust fan is located in the exhaust duct and joined to the motor by an insulation couplings In every instance the motor is isolated from duct for the aforesaid protective purposes both to the motor as well as to the booth. It is also evident that the principle of construction may be embodied either in a vertical or horizontal type assembly. Moreover the duct has communication with the motor compartment and suitable screened air circulation openings are provided to allow the suction fan to draw in atmosphere air for cooling the motor. It is thought unnecessary to repeat other structural distinctions and advantages of the invention because persons skilled in the art to which the invention relates will undoubtedly understand and appreciate the merits and advantages of this improved construction. 7

Minor changes in shape, size, material and rearrangement of parts coming Within the field of the invention or within'the scope of the following claims may be resorted to in actual practice if desired.

Having thus described my invention, what I claim as new is:

1. In a ventilator of the class described, frame work, a fireproof casing built around said frame work, a partition in said casing dividing it into individual compartments, one compartment being formed with a deflector plate and complemental pipe connections defining an exhaust duct, a rotary suction fan located in said duct, an operating shaft for said fan located in the duct and extending into the remaining compartment, a motor in said last named compartment operatively connected with the adjacent end of said fan shaft, said compartments being in communication With each other through the medium of screened openings and said fan serving to suck in atmospheric air for circulation through the motor compartment for cooling the motor, and said motor compartment having individual doors to permit access to be had to the compartment for repair and Inbricating purposes.

2. In a ventilator of the class described comprising a casing and a partition in said casing dividing it into individual compartments, a curved aperture deflector plate in one compartment cooperating therewith and defining an exhaust duct, predetermined walls of said last named compartment being provided with nipples affording pipe connections, said partition and one end wall of the remaining compartment being formedwith and a fan on the opposite end of the fan shaft, said fan being located in said duct.

In testimony whereof I affix my signature .HERMAN S. NOWITSKY I 

